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> someone who has struggled to eat enough to maintain and build weight There's a big difference between someone who feels satiated too quickly and someone who

> someone who has struggled to eat enough to maintain and build weight There's a big difference between someone who feels satiated too quickly and someone who has a lot of difficulty feeling satiated. It has nothing to do with how much exercise someone gets. It's also much more difficult to eat large quantities of clean calories (for putting on muscle) compared to eating large quantities of dirty calories (putting on fat).

watwut 1y ago
Exercise definitely affects apetite and in both ways - it can make you eat more or less. Calories are calories, neither dirty or clean.
- yetihehe 1y ago
  Yes, but we measure calories by burning food items in oxygen in calorimeters. Burning fat gives X amount of heat, burning fiber gives Y amount of heat. Fat and fiber both have calories when you burn them in a furnace. But body does not use fiber for calories, you won't get fat on fiber. That is the distinction between dirty and clean calories, not everything burnable will be usable for energy in body and not everything that body actually digests will be stored in fat tissue.
- Ferret7446 1y ago
  Calories are not calories, because they're a unit of energy, and humans aren't batteries. We "use" energy in the form of countless chemicals and reactions, so things get complicated fast. It's far easier to instead talk about mass, because one gram is indeed one gram, until humans evolve anti-matter producing organs. If you eat X and excrete Y, your body mass will change by X-Y. If you want to lose 1 kg, you will have to exhale 0.8 kg [1] of carbon atoms (you breath in O2 and exhale CO2). [1]: There are a lot of different "calorie" molecules in your body, but generally all of them are some combination of C, H, O, which turns into CO2 and H2O at roughly 4:1 ratio by mass. So 80% is lost via exhaling C, and the H2O gets processed by your body normally, and is generally lost as urine or sweat, unless you're dehydrated.
  - deleted 1y ago
    [deleted]

watwut 1y ago

Exercise definitely affects apetite and in both ways - it can make you eat more or less. Calories are calories, neither dirty or clean.

yetihehe 1y ago
Yes, but we measure calories by burning food items in oxygen in calorimeters. Burning fat gives X amount of heat, burning fiber gives Y amount of heat. Fat and fiber both have calories when you burn them in a furnace. But body does not use fiber for calories, you won't get fat on fiber. That is the distinction between dirty and clean calories, not everything burnable will be usable for energy in body and not everything that body actually digests will be stored in fat tissue.
Ferret7446 1y ago
Calories are not calories, because they're a unit of energy, and humans aren't batteries. We "use" energy in the form of countless chemicals and reactions, so things get complicated fast. It's far easier to instead talk about mass, because one gram is indeed one gram, until humans evolve anti-matter producing organs. If you eat X and excrete Y, your body mass will change by X-Y. If you want to lose 1 kg, you will have to exhale 0.8 kg [1] of carbon atoms (you breath in O2 and exhale CO2). [1]: There are a lot of different "calorie" molecules in your body, but generally all of them are some combination of C, H, O, which turns into CO2 and H2O at roughly 4:1 ratio by mass. So 80% is lost via exhaling C, and the H2O gets processed by your body normally, and is generally lost as urine or sweat, unless you're dehydrated.
- deleted 1y ago
  [deleted]